[T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

Lana Chan lana at cadence.com
Wed Jun 16 18:08:17 PDT 2021


Hi Tim,
I was curious if you had a chance to discuss this with other members and draw a conclusion?  Our end customer has requested an update on the  direction that we will take

Regards
Lana


From: t10-bounces at t10.org <t10-bounces at t10.org> On Behalf Of Lana Chan
Sent: Friday, May 14, 2021 8:39 AM
To: Tim.Symons at microchip.com
Cc: t10 at t10.org
Subject: Re: [T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

EXTERNAL MAIL
Hello Tim
Thank you as always for your assistance and expertise.  I'm looking forward to the resultant conclusion
Regards
Lana


From: Tim.Symons at microchip.com<mailto:Tim.Symons at microchip.com> <Tim.Symons at microchip.com<mailto:Tim.Symons at microchip.com>>
Sent: Thursday, May 13, 2021 4:44 PM
To: Lana Chan <lana at cadence.com<mailto:lana at cadence.com>>
Cc: t10 at t10.org<mailto:t10 at t10.org>
Subject: RE: [T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

EXTERNAL MAIL
Lana,
Thank you for your question.
This is an interesting scenario, I will need to review this will other member organizations for their opinions before responding with a recommendation.

Regards
Tim Symons
SPL-5 Editor

Tim Symons | Associate Technical Fellow
Microchip Technology Inc.
Tim.Symons at microchip.com<mailto:Tim.Symons at microchip.com>

[cid:image001.png at 01D521DF.19431CF0]



From: t10-bounces at t10.org<mailto:t10-bounces at t10.org> <t10-bounces at t10.org<mailto:t10-bounces at t10.org>> On Behalf Of Lana Chan
Sent: Thursday, May 6, 2021 11:38 AM
To: t10 at t10.org<mailto:t10 at t10.org>
Subject: [T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
Hello,
I am seeking clarification regarding END_TRAIN in Train-Tx Speed Negotiation Window in the Physical Layer in which the  Train-Tx comprises of the exchange of Transmitter Training Pattern between two SAS devices.

Per the Working Draft SAS Protocol Layer - 4 (spl4r11), Section - 5.11.4.2.3.4.2 Transmitter training,  the transmitter training pattern comprises of the following

[cid:image002.jpg at 01D762DA.94105590]

Can you please provide clarification for the following scenario:

  1.  Receiver does detect the END_TRAIN and TTIU received is considered as valid.
  2.  Receiver does not detect the END_TRAIN and still considered the received TTIU.
  3.  Receiver does not detect the END_TRAIN and discarded the received TTIU.

As per our understanding receiver discarded the TTIU, If END_TRAIN is not detected (point-3). We are not agreeing to point-2. Please let us know which scenario is valid.

Kind regards
Lana

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